social memory complex complex

[anagogy]

In 6D you can smooth distortions simply with thought. There must be a lot of distortions if it takes millions of years to progress through 6D.

Isn't oneness obtained when all individual distortions are smoothed?

Not just individual distortions, all distortions.  Oneness is distortion free.  But just because you have distortions doesn't mean you cannot experience oneness.  It just means you partake less purely in oneness than if the distortions weren't there.

Sometimes, and in fact most of the time, distortions are smoothed by melding with others.  Another's distortions are complementary to your own distortions.  You balance them, they balance you.  The melding of many is more than the sum of the parts.  

So you're correct, distortion is separation, but how they are smoothed looks different on every density level, even if the process is the same.  In some way, it always looks the same though.  It always looks like beings coming together for a common purpose.  Love is the steam roller for all distortions.